"House Tyrell traces our descent for Garth Greenhand, the legendary first King of the Reach, who made the land bloom... but so too does every house around us. It seems dear ancestor Garth "planted" as many flowers as he plucked. A king should have more consideration for his line, don't you think?"

Garth Gardener, also known as Garth Greenhand, is an unseen character in Game of Thrones. He is deceased when the series begins and has only appeared in the Complete Guide to Westeros and Histories & Lore featurettes.

In the A Song of Ice and Fire novels, half of the great noble Houses from the Reach claim descent from Garth Greenhand and House Gardener, of which House Tyrell and House Florent are the most prominent. Other powerful noble Houses in the Reach descended from Garth are House Rowan and House Oakheart. Because House Tyrell never ruled as kings, and because they are only one of several Houses that claim descent from Garth (and not even as close a descent as the Florents possess), they have always felt somewhat uneasy in their claim to dominion over the Reach.

A large number of Garth's successors were named after him. There were ultimately at least twelve kings of the Reach named Garth, including the original, as there is mention of a coin minted during the reign of "Garth XII".